UPDATE: I’ve found a new extension which is working well for me. It’s called HeaderToolsLite and you can get it here: HeaderToolsLite.

Years ago a great little extension called TB Header Tools was developed that allows you to change the email headers when using Thunderbird. This is great for when someone sends you an email without a subject line. I really wish this functionality was native to Thunderbird, but it’s yet to appear as a feature.

Unfortunately the TB Header Tools extension hasn’t been updated for years, so the official version is all but useless. However, where there’s a will there’s a way. Here’s how I got it working again in Thunderbird 6.

I have been trying to do this, but I have no idea how to save the corrected file or how to get it to the new name – TB_Header_Tools_0.7.1-tb5.xpi This is a function that I have been trying to get, and I do prefer Thunderbird as an e-mail client.

sounds good but does not work for me ! (This module was not installed because semms corrupted) (sorry translate from my french Thunderbird) …
Could you precise your settings in 7z when crating the new archive ?
format: 7z
compression level: Normal
compression type: LZMA
size block:
….

It works perfect, Thanks a lot..!
(I hesited before updating tb5 to tb6, and maybe loosing this fantastic tool to clean mailboxes – definitly would stay on old tb version rather than loosing this header tool..!)

Hi Leon,
I didn’t try yet this new HDLite, but …. finally tried to update, (on another computer to avoid no return) …and did it directly to TB 10.0.2, to check what happens, and ….
… it still works well with the version 0.7.2 modified by Gerald in August 2011, (in spite of a notice during TB update indicating the extensions won’t work without their updates)

I made some changes in the subjects of different emails received without problems and move them in different directories after, also without troubles…anything is clean.

…so for all who still hesit , Thunderbird 10.0.2 works too with TBHeader tools 0.7.2 ..!